<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        {{1+1}}<br>
        {{hello()}}<br>
        {{msg}}<br/>

        <span v-html="msg"></span>

        <br>

        <span v-text="msg"></span>
    </div>
    <script src="../node_modules/vue/dist/vue.js"></script>
    <script>
        new Vue({
            el: "#app",
            data:{
                msg: "<h1>hello</h1>"
            },
            methods: {
                hello(){
                    return "world!";
                }
            },
        })
    </script>
</body>
</html>